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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b795bad9fbd67ae3e501fff6b2cc6720ffe969c98b2509e95f1fa28f76623bb0' 
  AND token = 'QKAMkhRCnCTWp1jEqVEFEBSdsQhDW/eV6eUfCOcGYYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}